Best Compression Union Straights Deals of Nov 2026

Updated November 10, 2026Our site contains affiliate links for which we may be compensated.
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Qwork

QWORK 46pcs Brass Compression Tube Fittings, 1/8" 3/16" 1/4" 5/16" 3/8" 1/2" OD Straight Union Coupling Assortment Kit for Truck Airlines

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HASAOMOI Brass DOT 3/8'' Compression Straight Union for Nylon Tubings 4PCS | DOT APPROVED Straight Union Fittings for Nylon Hose, for Car Truck Trailers and Air Brake System

PREMIUM MATERIAL:Our Brass Compression Tube Fittings are made of high quality CA360 brass, with corrosion resistance, high temperature ductility and low permeability. Great for long time use, dot compression tube fitting assortment pneumatic fittings type: 3/8"
TYPICAL APPLICATION:The brass compression fittings for nylon tubing can be used with air systems, copper tubing in air lines brake systems, which is perfect for automotive car or truck repair or trailers daily parts replacement, air operated seats, operating gauges, air horns, heater controls, industrial workshops, daily garden or lawn mower repair, towing machine hose connection and air brake connections
EASY TO BE INSTALLED:The compression tubing sleeve connect two tube with same OD. Take out the outer sleeve and insert the nylon tube in, fasten the outer sleeve into the main body again. Make sure the small inside sleeve is kept together with the hose
MAX PRESSURE: Working pressure from vacuum to 250 psi. Temperature Range: -40° F to +200° F（-40°C to +93°C）(Note: see tubing manufacturer’s recommendations for pressure and temperature mutations)
PACKAGE INCLUDES:You will receive 4 pcs 3/8" Tube OD Brass Compression Tube Fitting, which can meet your needs of use and replacement, and you can also share them with others
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Taiidaues 178 Pcs DOT Quick Push to Connect Fittings Straight Union | Brass Compression Tube Fittings 1/8"5/32"1/4"5/16"3/8" 1/2" Air Line Fittings Push Lock Air Hose Fittings & Compression Union

【178-PIECE KIT】- Includes 18pcs DOT straight union kit ( 1/8" 4pcs+ 5/32" 4pcs+1/4" 4pcs+3/8" 4pcs+1/2" 2pcs) and 160pcs brass compression components (22pcs connectors+ 138 pcs ferrules,inserts and nuts in 6 sizes of 1/8" to 1/2"). Tackle diverse projects with a value-packed bundle
【PROFESSIONAL-GRADE BRASS】- The dot push to connect air fittings are crafted from high-quality CA 360 brass, Our brass compression fittings kit is made of high-quality brass, offering exceptional corrosion resistance, high-temperature ductility. Ideal for demanding environments, these fittings ensure long-term reliability in air, oil, gas, and water systems (non-potable use only, excludes potable water per U.S. federal law)
【DOT & INDUSTRY CERTIFIED SAFETY】- DOT-approved push-connect fittings meet FMVSS 571.106 and SAE J1131 standards for air brake systems, air suspension systems and so on, while compression fittings comply with ASA, ASME, and SAE specifications. Good sealing and repeatability, temperature and pressure resistance, long service life
"【HIGH-PRESSURE PERFORMANCE】- Push-Connect Fittings: Withstand up to 250 PSI and temperatures from -40°F to +200°F (-40°C to +93°C). Compression Fittings: Rated for 2000 PSI and extreme temps (-65°F to +250°F / -53°C to +121°C). Always verify tubing manufacturer limits for optimal safety
【QUICK INSTALLATION & VERSATILITY】- DOT push lock air fittings simplify repairs with push-to-connect fittings'one-tool-free assembly, Perfect for air suspension systems, trucks, RVs, industrial workshops, lawn mowers. Brass compression tube fittings no-weld, no-flare design, easy disassembly installation and maintenance, etc Perfect for air suspension systems, trucks, RVs, industrial workshops, lawn mowers, and oil/gas/water pipelines. Both types resist vibration and wear, ensuring stability in mobile and stationary systems
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6 Pcs 1/8" OD x 1/8" NPT Female Compression Union Connector, 1/8 Inch NPT Female to 1/8" OD Straight Coupling Adapter for Oil, Gas, and Non-potable Water

Complete Fitting Set: Includes 6pcs 1/8" Tube OD to 1/8" NPT Female Connector brass pipe fitting
Quality Construction: Compression Tube Fitting is crafted from premium solid brass, offering superior durability compared to iron fittings. Its high hardness ensures long-lasting performance even in demanding conditions
Smooth thread: Featuring tighter and deeper threads, our compression fittings minimize slippage and ensure a secure connection. The smooth thread design reduces installation resistance, enabling a hassle-free experience
Secure connection: The design of the compression connector fitting effectively compresses the ferrule by thread interlocking, achieving a tight seal around the tube due to radial shrinkage, providing secure connections for fluid transport
Widely Application: It is suitable for use with grease, fuels, LP, natural gas, refrigeration, instrumentation, and hydraulic systems in low and medium pressure applications. The fitting also connects various pipes, including air, fuel & water lines
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VALVENTO 316SS 1/2" OD x 1/2" OD Compression Tube Fitting Straight Union | 316 stainless steel straight adapter connector with double ferrules for oil, chemical, and natural gas tube connections

【Premium Stainless Steel】 316 stainless steel tube fittings have high strength and hardness, which can effectively resist the erosion of corrosive media. With a special silver - plating design inside, they can prevent rust and damage, ensure the long - term reliability of sealing, and ensure the normal operation of equipment.
【Double Ferrules Design】 The front and rear ferrules cooperate well. When tightening the nut, the front one bites into the tube for an initial seal, and the rear one offers extra support as a second - layer safeguard. This dual-seal design ensures a tight, leak-proof connection. It remains reliable under high pressure and vibration, capable of withstanding pressures up to the tube's bursting point.
【Superior Sealing Performance】 Ferrule compression tube fittings offer excellent sealing capabilities. The ferrules are designed to bite firmly into the tube surface when tightened, creating a tight and reliable seal. This prevents leaks of liquids or gases, even under high - pressure conditions. For example, in hydraulic systems where high - pressure fluids are transported, these fittings ensure that the system operates safely and efficiently without any loss of pressure.
【Easy Installation】 It usually only requires basic hand tools, such as wrenches. There's no need for complex welding or brazing operations, which saves time and labor during installation. This ease of installation also means that even non - professional users can handle the task, making it a convenient choice for industrial applications.
【Wide Compatibility】 Each end can be connected to a pipe. Widely used in various industries such as chemical engineering, oil and gas, food and beverage, pharmaceuticals, ship and ocean engineering, and hydraulic and pneumatic systems.
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HASAOMOI 5PCS Air Brake Nylon Tubing Brass DOT 5/8"Tube OD x 1/2"NPT Union | DOT Approved Compression Union Straight ,Air Line Adapter Air Suspension Kit for Truck Trailers and Air Brake System

High Quality Precision Brass: 5/8" Tube OD x 1/2" NPT thread straight DOT approved fittings are made of high quality solid CA360 brass with red sealent coated, durability and corrosion resistance
High Quality Precision Brass: 5/8" Tube OD x 1/2" NPT thread straight DOT approved fittings are made of high quality solid CA360 brass with red sealent coated, durability and corrosion resistance
DOT Approved: Meets D.O.T. FMVSS 571.106 approved, SAE J1131 air brake system requirements. For no air leakage, when installing our air suspension kit, please ensure that the cross section of the air line is smooth and flat, no gap, uneven, and the tube cannot be oval
Max Pressure: Working pressure from vacuum to 250 psi. Temperature Range: -40° F to +200° F（-40°C to +93°C）(Note: see tubing manufacturer’s recommendations for pressure and temperature mutations)
Wide Application: HASAOMOI brass compression fittings are suitable for automotive, pneumatic and air brake systems such as air bag spring suspension line repair kits, and also can be used for brake air lines and other conventional nylon air lines
brass compression fittings， Straight Union Fittings，Air Line fittings，Air Brake System，Air Compression Union Nylon Tube
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HASAOMOI 5PCS Air Brake Nylon Tubing Brass DOT 1/2"Tube OD x 1/2" NPT Union | DOT Approved Compression Union Straight ,Air Line Adapter Air Suspension Kit for Truck Trailers and Air Brake System

High Quality Precision Brass: 1/2" Tube OD x 1/2" NPT Thread straight DOT approved fittings are made of high quality solid CA360 brass with red sealent coated, durability and corrosion resistance
DOT Approved: Meets D.O.T. FMVSS 571.106 approved, SAE J1131 air brake system requirements. For no air leakage, when installing our air suspension kit, please ensure that the cross section of the air line is smooth and flat, no gap, uneven, and the tube cannot be oval
Max Pressure: Working pressure from vacuum to 250 psi. Temperature Range: -40° F to +200° F（-40°C to +93°C）(Note: see tubing manufacturer’s recommendations for pressure and temperature mutations)
Wide Application: HASAOMOI brass compression fittings are suitable for automotive, pneumatic and air brake systems such as air bag spring suspension line repair kits, and also can be used for brake air lines and other conventional nylon air lines
Package Include:You will receive 5pcs 1/2" Tube OD x 1/2" NPT Thread straight fittings, which can meet your needs of use and replacement, and you can also share them with others
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Taiidaues 10Pcs 3/8" OD x 3/8" NPT Male Compression Union Fittings | Brass Compression Tube Fitting,Straight Coupling Adapter,10PCS Compression Sleeves Ferrules & 1m Teflon Tape

You Will Get- 10 pcs 3/8" OD x 3/8" NPT Male Compression brass tube fittings, 10 pcs 3/8" OD Compression Sleeves Ferrules,1m teflon tape. NPT thread is the nominal pipe size and does not represent the actual diameter, please refer to the dimension drawing for specific diameter
High Quality Brass - Our 3/8" compression fitting kit is made of high-quality brass, with strong wear，corrosion resistance, high compressive strength, durability, low magnetic permeability and high temperature ductility
Widely Use- Brass compression tube fittings meet specifications and standards of ASA, ASME asn SAE. Good sealing and repeatability, temperature and pressure resistance. Perfect fit for oil, gas, water and other non-corrosive or corrosive pipeline systems, no need for welding and flaring tools, easy disassembly, installation and maintenance, etc
WORKING PRESSURE & TEMPERATURE - 2000 PSI maximum working pressure, temperature range -65°F to +250°F (-53°C to +121°C)
Tips- These copper tubing fittings contain lead and are not allowed by federal law to be installed for potable water use in the U.S.A. and its territories
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8mm Brass Compression Tube Fitting, Female Compression Union | Straight Connector for Fuel, Air, Liquid, Oil, Gas, Vacuum Lines

[Accurate Specifications]: 8mm pipe outer diameter x 8mm pipe outer diameter brass compression pipe joint, using threaded interlocking compression sleeve design, radial shrinkage of inner diameter at both ends, tightly covering the pipe body, achieving equal diameter straight connection of the pipeline.
[Sealing and Leak Prevention]: The shrink structure of the sleeve can seamlessly fit with the pipe body, forming a tight sealing surface that effectively blocks the leakage of media such as fuel, air, and liquids. The sealing performance is excellent, ensuring the stable operation of the pipeline system.
[Durable and Anti-corrosion]: Made of high-quality brass material, it combines wear resistance, corrosion resistance, and high compressive strength. It has good high-temperature ductility and low magnetic permeability, making it not easily damaged or deformed, and suitable for long-term use in complex working conditions.
[Wide Range Tolerance]: can withstand working pressure from 0 to 1MPa, adapt to temperature range of -50 to 120 ℃, and have stable performance in high and low temperature and variable pressure environments, meeting the stringent requirements of multi-media pipelines.
[Multi Purpose Application]: widely applicable to non potable water pipeline systems such as fuel, air, liquid, oil, gas, vacuum, etc., not suitable for drinking water transportation, suitable for industrial pneumatic, hydraulic and other pipeline connection scenarios.
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Our #1 Pick Today
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Qwork

QWORK 46pcs Brass Compression Tube Fittings, 1/8" 3/16" 1/4" 5/16" 3/8" 1/2" OD Straight Union Coupling Assortment Kit for Truck Airlines

Details & specs
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on Amazon.com
Disclaimer: While we make every effort to ensure accuracy, we cannot guarantee that all product specifications, pricing, discounts, and details are complete or error-free. Because information is subject to change, we recommend verifying all details directly with the retailer prior to making a purchase. As an Amazon Associate, we earn from qualifying purchases.

9 Compression Union Straights deals are available from: Amazon, starting from $6.51.

The lowest price we found is $6.51 while the highest is $59.99. Prices for the best Compression Union Straights deals average at $20.49.